Improvement in sewing-machines



PATE FICE,

VILLIAM H. BUKER, OF JOHNSTOVN, NEV YORK.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 117,380, dated July 25, 1871 antedated July 20, 1871.

To all whom it may concern.-

Be it known that I, WILLIAM H. BUKEE, of Johnstown, in the county of Fulton and in the State of New York, have invented certain new and useful Improvements in Attachment for Sewing-liIachines and do hereby declare that the following is a full, clear, and exact description thereof', reference being had to the accompanying drawing and to the letters of reference marked thereon making `a part of this specification.

The nature of my invention consists in a guide or regulator attached to the shuttle-driver of a sewing-machine for the purpose of compensating for any wear of the shuttle and shuttle-race, as will be hereinafter more fully set forth.

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed to describe its construction and operation, referring to the annexed' drawing, in which- Figure l is a plan view of a portion of a sewing-machine, showing the shuttle and a part of the shuttle-race and my device attached to the shuttle-driver. Fig. 2 is a similar view, showing a modification of the device represented in Fig. l.

A represents the bed of a sewing-machine. B v

p bar, E, which I denominate a guide or regulator,

it being constructed substantially in the manner shown in Fig. 1. To its outer, that is, loose end, on the side away from the shuttle, is attached a wire spring, G, which runs along the back of the guide and beyond its pivoted end for any suitable distance, when it is bent toward the shuttle,V and back between the guide and the shuttle, having at its end a pad, b, the outer end of which is curved and bent under the end of the guide. On the back of the guide E, at any desired point, is a projection, a., and opposite the same on the shuttle-driver is a, pin, e, against the other side of which the spring G bears. H represents the needle-plate or throat-plate of the machine, on the under side of which is a pin, z, so arranged that during the backward and forward movement of the shuttle-driver said pin will come on the back of the outer end of the guide E, forcing the saine a short distance toward the shuttle. This motion ofthe guide E will necessarily throw the pad I) against the shuttle and press it again st the side of the race just at the time when the shuttle is to take the loop formed by the needlethread.

In some machines the short motion ofthe guide would not be sufficient to throw the pad against the shuttle to force it close to the side ofthe race, and to remedy this defect I have added the pin e, so that when the guide is moved by contact with the pin 1T the spring G will bear against the oft' side of the pin e and increase the motion or' the pad. vAs soon as the shuttle has taken up the loop, and before the loop reaches the pad b, the guide will have cleared the pin fi, and the spring G throws the guide back int-o its original position, and at the same time removes the pad from the shuttle so as to allow the loop free passage around the same. At the end where the guide E is pivoted to the shuttle-driver, on the side toward the shuttle, is a short groove, in which the spring G will lit and be held so that it cannot spring up and get away from the shuttle, but must at all times operate on the same.

In all shuttle machines the race and shuttle will wear, and as a consequence stitches will be skipped, and the machine soon becomes worthless without a new shuttle. By the use of my device attached to the shuttle-driver, the shuttle, it does not matter how much worn, willbe pressed close up to the race just at the time when it is necessary to be in such position, namely, at the time when the loop is to be taken up by the shuttle.

In some machines the top of the shuttle-driver is grooved or slotted, in which case the guide or regulator cannot be attached to the same. In such cases I use a plate, to which are attached the regulator, spring, &c., and said plate is then attached to the shuttle-driver.

In Fig. 2 I have represented a modification of the above device, in which the guide or regulator E extends in the opposite direction, and is operated by a pin, i', at the end of' the way for the shuttle-driver. The spring G then extends along the oft' side ofthe guide beyond the pivotpoint, and ha-s the pad .b at its other end, asV shown. The spring G in this case bears against a headed pin, e', which answers the same purand pad b, the pins e and i, or their equivalents, arranged to operate substantially as and for the purposes herein set forth.

In testimony that I claim the foregoing I have hereunto set my hand this lst day of December,

WILLIAM H. BUKER.

Witnesses:

C. L. EBERT, p J. E. HUToHINsoN. 

